Atomic KB vs SoloPDF
Price, ratings, monetisation and update history for both apps, side by side â with what reviewers say about each.
Atomic KB
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Atomic is a client for your self-hosted Atomic knowledge base. It connects to your own server to give you mobile access to your notes, saved articles, and semantic search. Save any web page from Safari or any browser using the Share Extension â Atomic automatically extracts the article content, generates embeddings, and connects it to your existing knowledge. Features: - Browse, create, and edit markdown notes - Save web articles from any app via the Share Extension - Semantic and hybrid search across your knowledge base - Hierarchical tag browsing - Offline support with local caching - Connect via QR code or manual setup Requires a self-hosted Atomic server. Learn more at https://github.com/kenforthewin/atomic
SoloPDF
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SoloPDF is a clean, fast, fully local PDF reader â no ads, no account, nothing ever uploaded. âĸ Reading: multiple tabs, outline, page thumbnails, full-text search, fit-width/fit-page zoom. Huge files open instantly thanks to on-demand loading. âĸ Highlights become notes: highlight any text and the annotation is saved as a Markdown notes file (.annotations.md) right next to the PDF â open, edit, and version it with any editor (including our SoloMD). solopdf:// links inside the notes jump straight back to the highlighted passage. âĸ Forms: fill AcroForm PDFs (text fields, checkboxes, dropdowns) and save the result. âĸ Export to Markdown: turn a whole PDF into a Markdown document, outline headings included. âĸ Dark mode with smart page inversion for comfortable night reading. âĸ Interface in English, įŽäŊ䏿, įšéĢ䏿, and æĨæŦčĒ. Everything runs on your device. No network calls, no data collection.
Screenshots
Verdict
The clearest difference is device support: SoloPDF at 4 against Atomic KB's 2. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price ¡ Rating ¡ Positive reviews ¡ Number of ratings ¡ Update frequency ¡ Ads ¡ In-app purchases ¡ Monetization ¡ Best chart rank ¡ Devices ¡ Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Atomic KB ships an update every 2 months, SoloPDF monthly. The most recent releases landed on September 18, 2026 and September 24, 2026 respectively.
| Parameter | Atomic KB | SoloPDF |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Monthly â better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Mac â better |
| Requires iOS | 15.0 | 15.0 |
| Further details â not scored | ||
| Size | 6 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Foldspace Labs LLC | åä¸ æ |
In-app purchases
Atomic KB
No in-app purchases
SoloPDF
No in-app purchases







